In the literature those angular integrals were mostly considered in terms
of the integrals, which we call in our paper the
Neerven integrals [1]}, [2]}:
\(I^{j,l}_D=\int \mathrm {d}\Omega _{k_1 k_2}\frac{1}{(a+b\cos \theta _1)^j(A+B\cos \theta _1+C\sin \theta _1\cos \theta _2)^l}\,,\) 
